This ancient weapon set was crafted in the Halls of one of the first true Dwarven nations, by a miner, smith and artificer of Clan IronFist by the name of Derglaer. While searching a tunnel for a vein of ore he came across a shard of obsidian crystal intertwined with a ribbon of golden metal, both of which the likes he had never seen nor heard of. He tucked it away in a pack so that he could examine it later. Back in his lab he began trying to separate the two, only to find a thin layer of a clear crystal almost like glass separating them, but keeping them firmly fused together, and through it all he heard persistent voices in his head. He shut himself off from everyone for a few weeks, working nonstop until he came to realize that somehow the materials housed elements of the outer planes. The golden metal he found out from an ancient tome, was called Lustrum (referred to by the dwarves as ‘Dumathoin’s Mantel’, which in some lighting, had a lavender hue), and seemed to house some aspect of the ‘Higher Planes’. The obsidian ended up being something called Abyssal Diamond, this was only found in the Nine Hells and contained some bit of that aspect within. The Glass substance between the two was unknown and when the two pieces were spread apart, it seemed to expand and retract but would never let them get more than a few feet apart. Derglaer hid the materials away for over 2 centuries, every day hearing the voices, everyday losing a bit of his sanity and his soul. Growing old and having the feeling that something tragic was about to happen, one night he barred himself in the great forge and went to work. Everything that he had was put into the creation, and when his clanmates managed to break in hours later they found the husk of what was Derglaer and two scimitars, one Abyssal Diamond and one Dumathoin’s Mantel connected by a clear glass chain, with 10 links, one tinted with a swirling blue and red mist inside.

Two days after the tragic incident the clan of IronFist was attacked by a host of demonic entities, most of the dwarves were killed in the retreat. Unknown to the dwarves, having completed the task they were summoned for, the demons left shortly after (about 50 years after the assault) and the mines became a ruin lost to time.
Adventurers have been in parts of the stronghold, not knowing the truth of the grand place they were in. At some point in the past, the blades were pulled out, along with most of the other dwarven treasures. It wasn’t until 500 years later that the twin sons of the last king began their quest to retake the nation, and then the search to reclaim its lost treasures.

These 2 blades are connected by a chain seemingly made of glass and consisting of ten links, the Soul Chain, that seems to change in size on mental command by its wielder, the length can vary from ten inches (each link is a small, about 1 inch) when sheathed, to 10 foot (each link is about 1 foot long) as when being used for Order and Chaos. Every creature killed by one of the blades has a portion of its being absorbed through the blade and stored in the Soul Chain (three souls are required to fill one link).

They are at their base a +1 scimitars, however, whenever the bearer kills a creature, weapons gain a soul. As a bonus action, the bearer can use any number of filled links to deal that much extra magical damage + character lvl on their next attack. Otherwise the wielder can decide to use the filled links + character lvl to heal any target within 15 ft.

Order and Chaos 

Five times per short rest, as long as the chain is storing 1 soul, as an action, the user can spin one of the blades with a flourish (Acrobatics or Perform DC 16), throwing it at a target up to 10 foot away. If the Saint is used, and the attack strikes, it deals 1D4 radiant damage per filled link (expending all souls in the links) + the characters Acrobatics or Perform skill, all damage done is channeled back to the wielder as HP. If the Sinner is used, and the attack strikes, it deals 1D8 necrotic damage per filled link (expending all souls in the links) + the characters Acrobatics or Perform skill, and gives the target disadvantage on all attacks and saving throws for a number of rounds equal to the number of links that were filled.